btrfs-image - create/restore an image of the filesystem
[options] <source> <target>
is used to create an image of a btrfs filesystem. All data
will be zeroed, but metadata and the like is preserved. Mainly used for
In the dump mode, source is the btrfs device/file and target is the output file
In the restore mode (option -r), source is the dumped image and target is the
Restore metadump image. By default, this fixes
super’s chunk tree, by using 1 stripe pointing to primary device, so
that file system can be restored by running tree log reply if possible. To
restore without changing number of stripes in chunk tree check -o
Compression level (0 ~ 9).
Number of threads (1 ~ 32) to be used to
process the image dump or restore.
Use the old restore method, this does not
fixup the chunk tree so the restored file system will not be able to be
Sanitize the file names when generating the
image. One -s means just generate random garbage, which means that the
directory indexes won’t match up since the hashes won’t match
with the garbage filenames. Using -ss will calculate a collision for the
filename so that the hashes match, and if it can’t calculate a
collision then it will just generate garbage. The collision calculator is very
time and CPU intensive so only use it if you are having problems with your
file system tree and need to have it mostly working.
Walk all the trees manually and copy any
blocks that are referenced. Use this option if your extent tree is corrupted
to make sure that all of the metadata is captured.
Restore for multiple devices, more than 1
device should be provided.
will return 0 if no error happened. If any problems happened,
1 will be returned.